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Anomolous Fatigue Crack Growth Phenomena in High-Strength Steel (June 21, 2004)

Author: Forth, Scott C.; James, Mark A.; Johnston, William M., Jr.; Newman, James C., Jr
Subject: AIR TRANSPORTATION; ECONOMIC FACTORS; REGULATIONS; GOVERNMENT/INDUSTRY RELATIONS; AIRLINE OPERATIONS; COSTS; QUALITY; EFFECTIVENESS; TRANSPORTATION NETWORKS; OPTIMIZATION
Year: 2004
Language: English
Book contributor: NASA
Collection: nasa_techdocs

Description

The growth of a fatigue crack through a material is the result of a complex interaction between the applied loading, component geometry, three-dimensional constraint, load history, environment, material microstructure and several other factors. Previous studies have developed experimental and computational methods to relate the fatigue crack growth rate to many of the above conditions, with the intent of discovering some fundamental material response, i.e. crack growth rate as a function of something. Currently, the technical community uses the stress intensity factor solution as a simplistic means to relate fatigue crack growth rate to loading, geometry and all other variables. The stress intensity factor solution is a very simple linear-elastic representation of the continuum mechanics portion of crack growth. In this paper, the authors present fatigue crack growth rate data for two different high strength steel alloys generated using standard methods. The steels exhibit behaviour that appears unexplainable, compared to an aluminium alloy presented as a baseline for comparison, using the stress intensity factor solution.

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Identifier:	nasa_techdoc_20050158690
Document-source:	CASI
Documentid:	20050158690
Nasa-center:	Langley Research Center; Marshall Space Flight Center
Online-source:	http://wayback.archive-it.org/1792/20100215045750/http://hdl.handle.net/2060/20050158690
Original-nasa-rights:	Unclassified; Copyright; Unlimited; Publicly available;
Updated-added-to-ntrs:	2009-07-29
Licenseurl:	http://creativecommons.org/licenses/publicdomain/
Mediatype:	texts
Rights:	Public Domain
Identifier-access:	http://www.archive.org/details/nasa_techdoc_20050158690
Identifier-ark:	ark:/13960/t0xp7wg93
Ppi:	300
Ocr:	ABBYY FineReader 8.0